A quick clamping device for a reference frame

Abstract

The present invention discloses a quick clamping device for a reference frame, belonging to the field of medical devices, comprising: a fixed clamping arm provided with two first abutting end faces with an included angle therebetween, and the fixed clamping arm is also provided with a connecting channel penetrating therethrough; a moving clamping arm capable of being partially movably arranged in the connecting channel, and the moving clamping arm is provided with a second abutting end face; when the moving clamping arm reciprocates along the central axis of the connecting channel, the second abutting end face faces the first abutting end face, and the angular bisecting plane of the two first abutting end faces is always perpendicular to the second abutting end face. Through the above arrangement, when the fixed clamping arm and the moving clamping arm of the present invention clamp a cylindrical instrument, the first abutting end face and the second abutting end face respectively form three abutting tangents on the outer wall of the cylindrical instrument, the three abutting tangents are parallel to each other and the perpendicular distance between any two abutting tangents is the same, and various cylindrical instruments with different outer diameters can be quickly clamped, and the clamped cylindrical instrument is uniformly stressed and not easily detached.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and particularly relates to a quick-loading clamp for a reference frame. Background Art

[0002] The surgical navigation system is based on medical imaging data such as magnetic resonance imaging (MRI) and computed tomography (CT). It accurately matches the preoperative or intraoperative imaging data of the patient with the anatomical structure of the patient on the operating table. During the operation, it tracks the surgical instruments and updates and displays the position of the surgical instruments in real time on the patient's image in the form of a virtual probe, enabling the doctor to understand the relative position of the instruments to the patient. Thus, it helps the doctor to understand whether the movement path of the surgical instruments will cause additional damage to the human body, helps the doctor determine that the surgical instruments have reached the lesion location, makes the operation safer and faster, and greatly reduces the pain of the patient during the operation. The hardware part in the surgical navigation system is specifically a reference frame that can be recognized by the image recognition system. The reference frame usually needs to be combined with a cylindrical implantable treatment instrument to assist the surgical navigation system in positioning the treatment instrument.

[0003] When quickly combining the reference frame with the cylindrical instrument currently, a quick-loading clamp with a clamp structure is used to connect with the cylindrical instrument. The existing clamps usually have flat clamping plates or clamping plates with a certain curvature. Among them, the flat clamping plate has a small contact area with the cylindrical instrument and a large pressure at the contact position, and it is easy to have relative sliding with the clamped cylindrical instrument when the center of gravity of the quick-loading clamp deviates; while the clamping plate with a curvature can clamp the cylindrical instrument more firmly, but it is not convenient to adapt to a variety of cylindrical instruments with different diameters.

[0004] Therefore, a quick-loading fixture that can stably clamp a variety of cylindrical instruments with different diameters is designed, and this quick-loading fixture is specifically a quick-loading clamp for a reference frame. Summary of the Invention

[0005] In order to overcome the problems proposed in the background art, the present invention adopts the following technical solutions:

[0006] A quick-loading clamp for a reference frame, comprising: a fixed clamping arm, which is connected with a setting frame with an NDI ball, the fixed clamping arm is provided with two first abutting end faces, and the two first abutting end faces form an included angle; a moving clamping arm, the moving clamping arm is provided with a second abutting end face; the second abutting end face faces the first abutting end faces, and the angular bisecting plane of the two first abutting end faces is always perpendicular to the second abutting end face; when the two first abutting end faces and a second abutting end face are in close contact with three parallel sides of the cylindrical section of the operating instrument for navigation surgery to be clamped, the operating instrument is fixedly clamped by the three abutting end faces.

[0007] Furthermore, a connection channel is provided through the fixed clamping arm, and the moving clamping arm can be partially movably arranged in the connection channel. When the part of the moving clamping arm inside the connection channel reciprocates along the axial direction of the connection channel, it drives the part of the moving clamping arm outside the connection channel to reciprocate along the axial direction of the connection channel. The second abutting end face is arranged on the outer wall of the part of the moving clamping arm outside the connection channel. When the moving clamping arm moves, it drives the second abutting end face to approach or move away from the first abutting end face.

[0008] Furthermore, a driving bolt is further included. The driving bolt is partially movably arranged in the connection channel; a connection screw hole is provided through the moving clamping arm. When the moving clamping arm is connected to the connection channel, the central axis of the connection screw hole coincides with the central axis of the connection channel; the part of the driving bolt inside the connection channel is bolted to the connection screw hole. When the driving bolt rotates around its own axis, it drives the moving clamping arm to reciprocate along the axial direction of the connection channel.

[0009] Furthermore, the moving clamping arm includes an integrally connected arc section and a vertical section. The second abutting end face is arranged on the vertical section, and the connection screw hole is arranged on the arc section. The arrangement of the arc section is equivalent to providing a reinforcing rib between the connection screw hole and the second abutting end face, which can effectively improve the structural stability when the second abutting end face and the first abutting end face clamp a cylindrical instrument and reduce the stress on the connection between the arc section and the vertical section.

[0010] Furthermore, a first limiting groove is provided in the fixed clamping arm. The first limiting groove communicates with the connection channel. A part of the moving clamping arm extends out of the connection channel through the first limiting groove. The second abutting end face is arranged on the part of the moving clamping arm extending out of the connection channel; the moving clamping arm can move along the axial direction of the connection channel to a proximal position and abut against the first limiting groove. When the moving clamping arm moves to the proximal position, the first abutting end face and the second abutting end face do not contact.

[0011] Furthermore, a clamping area is formed between the first abutting end face and the second abutting end face. When the moving clamping arm reciprocates in the connection channel, the inner diameter of the clamping area enlarges or shrinks; the first limiting groove restricts the moving clamping arm from rotating around the central axis of the connection channel, so that the moving clamping arm can only reciprocate along the axial direction of the connection channel.

[0012] Further, a limit cap is provided at the end of the driving bolt facing away from the connection channel, and the outer diameter of the limit cap is greater than the inner diameter of the connection channel; a groove is provided on the limit cap. A limit boss is circumferentially provided on the outer wall of the driving bolt, and the outer diameter of the limit boss is not greater than the inner diameter of the connection channel; a first pin hole is provided on the fixed clamping arm, the first pin hole communicates with the connection channel, and a first pin shaft is movably arranged in the first pin hole. When the first pin shaft enters the connection channel, the axial movement of the driving bolt is restricted; the limit cap and the limit boss do not contact each other.

[0013] Further, a second pin hole is provided on the fixed clamping arm, the second pin hole communicates with the connection channel, and a second pin shaft is movably arranged in the second pin hole; when the second pin shaft enters the connection channel through the second pin hole, the movement of the movable clamping arm away from the connection channel is restricted.

[0014] Further, a second limit groove is provided on the movable clamping arm. When the movable clamping arm moves to a distal position in the connection channel, the second pin shaft abuts against the inner wall of the second limit groove.

[0015] Further, the fixed clamping arm is provided with a connecting frame, the connecting frame is provided with positioning screw holes, the number of the positioning screw holes is at least one, and a setting frame with NDI small balls is connected to the connecting frame.

[0016] Further, along the axial direction of the driving bolt, the length of the part of the driving bolt with an outer diameter smaller than the inner diameter of the connection channel is not less than the length of the connection channel. When the driving bolt rotates and drives the movable clamping arm to move away from the connection channel, the axial length of the part of the driving bolt sleeved in the connection screw hole is greater than zero.

[0017] Advantages of the present invention:

[0018] By providing a fixed clamping arm with two first abutting end faces and a movable clamping arm with one second abutting end face, and the angular bisecting plane of the two first abutting end faces is always perpendicular to the second abutting end face, the sum of the pressures exerted on the clamped instrument by the two first abutting end faces is equal in magnitude and opposite in direction to the pressure exerted on the clamped instrument by the second abutting end face, so that the relative stability between the clamped instrument and the quick-release clamp can be well maintained, and the clamped instrument is prevented from slipping off between the fixed clamping arm and the movable clamping arm. By providing a connection channel on the fixed clamping arm, the movable clamping arm can and can only move relative to the fixed clamping arm along the axial direction of the connection channel, so that the distance between the movable clamping arm and the fixed clamping arm can be adjusted, and the quick-release clamp can clamp cylindrical instruments with various diameters. Description of the Drawings

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. Among them:

[0020] Figure 1 It is a schematic assembly structure diagram of the present invention when the moving clamping arm moves to the proximal position;

[0021] Figure 2 is Figure 1 a schematic cross-sectional structure diagram of;

[0022] Figure 3 It is a schematic assembly structure diagram of the present invention when the moving clamping arm moves to the distal position;

[0023] Figure 4 It is an exploded structure diagram of the present invention;

[0024] Figure 5 It is a schematic overall structure diagram of the moving clamping arm;

[0025] Figure 6 It is a schematic overall structure diagram of the fixed clamping arm;

[0026] Figure 7 is Figure 6 a schematic cross-sectional structure diagram of;

[0027] Figure 8 It is a schematic overall structure diagram of the driving bolt;

[0028] In the figure, 1, fixed clamping arm; 11, first abutting end face; 12, connecting channel; 13, first limiting groove; 14, first pin hole; 141, first pin shaft; 15, second pin hole; 151, second pin shaft; 16, connecting frame; 161, positioning screw hole; 2, moving clamping arm; 21, second abutting end face; 22, connecting screw hole; 23, second limiting groove; 24, arc segment; 25, vertical segment; 3, driving bolt; 31, limiting boss; 32, limiting cap; 321, groove. Detailed implementation manners

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below through specific specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation manners. Without conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0030] A quick clamp for a reference frame, as Figure 1-8 shown, includes: a fixed clamp arm 1, which is connected to a setting frame with NDI balls. The fixed clamp arm 1 is provided with two first abutting end faces 11, and the two first abutting end faces 11 have an included angle, and the included angle is not less than 30°. A moving clamp arm 2, the moving clamp arm 2 is provided with a second abutting end face 21; the second abutting end face 21 faces the first abutting end face 11, and the angular bisecting plane of the two first abutting end faces 11 is always perpendicular to the second abutting end face 21; when the two first abutting end faces 11 and a second abutting end face 21 are in close contact with three parallel sides of the cylindrical section of the operating instrument for navigation surgery to be clamped, the operating instrument is fixedly clamped by the three abutting end faces. Because the angular bisecting plane of the two first abutting end faces 11 is always perpendicular to the second abutting end face 21 and passes through the second abutting end face 21, the outer wall of the cylindrical instrument can maintain a stable posture under the action of the normal pressure on each contact surface when being abutted by the three abutting end faces. Compared with the setting where the two clamping plates in a conventional clamp are parallel to each other, the first abutting end face 11 and the second abutting end face 21 are always tangent planes of the same cylindrical surface. Therefore, it can clamp the cylindrical instrument by means of circumferential multi-point abutting, and can limit the radial movement of the clamped instrument.

[0031] In some embodiments of the present application, as Figure 1-8 shown, the fixed clamp arm 1 is provided with a connecting channel 12 running through it. The moving clamp arm 2 can be movably arranged partially in the connecting channel 12. When the part of the moving clamp arm 2 in the connecting channel 12 reciprocates along the axial direction of the connecting channel 12, it drives the part of the moving clamp arm 2 outside the connecting channel 12 to reciprocate along the axial direction of the connecting channel 12. The second abutting end face 21 is arranged on the outer wall of the part of the moving clamp arm 2 outside the connecting channel 12. When the moving clamp arm 2 moves, it drives the second abutting end face 21 to approach or move away from the first abutting end face 11.

[0032] In some embodiments of the present application, as Figure 1-8As shown, it further includes a driving bolt 3, and the movement of a part of the driving bolt 3 is arranged in the connecting channel 12; a connecting screw hole 22 is formed through the moving clamping arm 2. When the moving clamping arm 2 is connected to the connecting channel 12, the central axis of the connecting screw hole 22 coincides with the central axis of the connecting channel 12; the part of the driving bolt 3 in the connecting channel 12 is bolted to the connecting screw hole 22, and when the driving bolt 3 rotates around its own axis, it drives the moving clamping arm 2 to reciprocate axially along the connecting channel 12.

[0033] In some embodiments of the present application, as Figure 1-8 shown, the moving clamping arm 2 includes an arc section 24 and a vertical section 25 which are integrally connected. The abutting end face two 21 is arranged on the vertical section 25, and the connecting screw hole 22 is arranged on the arc section 24. The arrangement of the arc section 24 is equivalent to arranging a reinforcing rib between the connecting screw hole 22 and the abutting end face two 21, which can effectively improve the structural stability when the abutting end face two 21 and the abutting end face one 11 clamp the cylindrical instrument, and reduce the stress at the connection between the arc section 24 and the vertical section 25.

[0034] In some embodiments of the present application, as Figure 1-8 shown, the fixed clamping arm 1 is provided with a first limiting groove 13, and the first limiting groove 13 communicates with the connecting channel 12. A part of the moving clamping arm 2 extends out of the connecting channel 12 through the first limiting groove 13, and the abutting end face two 21 is arranged on the part of the moving clamping arm 2 extending out of the connecting channel 12; the moving clamping arm 2 can move axially along the connecting channel 12 to a proximal position and abut against the first limiting groove 13. When the moving clamping arm 2 moves to the proximal position, the abutting end face one 11 and the abutting end face two 21 do not contact.

[0035] In some embodiments of the present application, as Figure 1-8 shown, a clamping area is formed between the abutting end face one 11 and the abutting end face two 21. When the moving clamping arm 2 reciprocates in the connecting channel 12, the inner diameter of the clamping area enlarges or shrinks; the first limiting groove 13 restricts the moving clamping arm 2 from rotating around the central axis of the connecting channel 12, so that the moving clamping arm 2 can only reciprocate axially in the connecting channel 12.

[0036] In some embodiments of the present application, as Figure 1-8As shown in the figure, a limit cap 32 is provided at the end of the driving bolt 3 departing from the connection channel 12, and the outer diameter of the limit cap 32 is larger than the inner diameter of the connection channel 12; a groove 321 is provided on the limit cap 32, and the groove 321 is specifically one of a regular hexagonal groove or a cross groove. A limit boss 31 is circumferentially provided on the outer wall of the driving bolt 3, and the outer diameter of the limit boss 31 is not larger than the inner diameter of the connection channel 12; the fixed clamping arm 1 is provided with a first pin hole 14, the first pin hole 14 is communicated with the connection channel 12, and a first pin shaft 141 is movably arranged in the first pin hole 14. When the first pin shaft 141 enters the connection channel 12, the axial movement of the driving bolt 3 is restricted; the limit cap 32 is not in contact with the limit boss 31. When the first pin shaft 141 abuts against the fixed clamping arm 1 at the end of the limit cap 32 facing the connection channel 12 and enters the connection channel 12, it can be stuck between the limit cap 32 and the limit boss 31, thereby restricting other movement forms of the driving bolt 3 except for rotating around its own axis. When the driving bolt 3 is in this limited state, the movement of the moving clamping arm 2 in the connection channel 12 is completely controllable.

[0037] In some embodiments of the present application, as Figure 1-8 shown, the fixed clamping arm 1 is provided with a second pin hole 15, the second pin hole 15 is communicated with the connection channel 12, and a second pin shaft 151 is movably arranged in the second pin hole 15; when the second pin shaft 151 enters the connection channel 12 through the second pin hole 15, the movement of the moving clamping arm 2 away from the connection channel 12 is restricted. A second limit groove 23 is provided on the moving clamping arm 2. When the moving clamping arm 2 moves to a distal position in the connection channel 12, the second pin shaft 151 abuts against the inner wall of the second limit groove 23.

[0038] In some embodiments of the present application, as Figure 1-8 shown, the fixed clamping arm 1 is provided with a connecting frame 16, the connecting frame 16 is provided with a positioning screw hole 161, the number of the positioning screw holes 161 is at least one, and the setting frame with NDI balls is connected to the connecting frame 16. Along the axial direction of the driving bolt 3, the length of the part of the driving bolt 3 whose outer diameter is smaller than the inner diameter of the connection channel 12 is not less than the length of the connection channel 12. When the driving bolt 3 rotates and drives the moving clamping arm 2 to depart from the connection channel 12, the axial length of the part of the driving bolt 3 sleeved in the connection screw hole 22 is greater than zero.

Claims

1. A reference frame quick-release clamp, characterized in that: include, A fixed clamp arm is connected to a setting frame with an NDI ball, and the fixed clamp arm is provided with two abutting end faces 1, and the two abutting end faces 1 have an included angle, A moving clamp arm, wherein the moving clamp arm is provided with a second abutting end surface; the second abutting end surface faces the first abutting end surface, and the angular bisectors of the two first abutting end surfaces are always perpendicular to the second abutting end surface; When the two abutting end surfaces 1 and the one abutting end surface 2 are in close contact with the three parallel sides of the columnar section of the navigation surgery operating instrument to be clamped, the operating instrument is fixedly clamped by the three abutting end surfaces.

2. A reference frame quick-release clamp according to claim 1, characterized in that: The fixed clamp arm is provided with a connecting passage running through it, and the movable clamp arm can be partially moved in the connecting passage.

3. A reference frame quick-release clamp according to claim 2, characterized in that: It also includes a driving bolt, and the movement of the driving bolt part is arranged in the connecting channel; the moving clamp arm is penetrated by a connecting screw hole, and when the moving clamp arm is connected to the connecting channel, the central axis of the connecting screw hole coincides with the central axis of the connecting channel; the part of the driving bolt in the connecting channel is bolt-connected to the connecting screw hole, and when the driving bolt rotates around its own axial direction, it drives the moving clamp arm to reciprocate along the axial direction of the connecting channel.

4. A reference frame quick-release clamp according to claim 3, characterized in that: The moving clamp arm comprises an arc section and a vertical section which are integrally connected, the second abutting end surface is arranged on the vertical section, and the connecting screw hole is arranged on the arc section.

5. A reference frame quick-release clamp according to claim 4, characterized in that: The fixed clamp arm is provided with a limiting groove 1, and the limiting groove 1 is connected with the connecting channel, and the moving clamp arm part extends out from the connecting channel through the limiting groove 1, and the tightening end face 2 is arranged on the part of the moving clamp arm extending out of the connecting channel; the moving clamp arm can move to a proximal position along the axial direction of the connecting channel and tighten against the limiting groove 1, and when the moving clamp arm moves to the proximal position, the tightening end face 1 is not in contact with the tightening end face 2, and a clamping area is formed between the tightening end face 1 and the tightening end face 2, and the inner diameter of the clamping area is enlarged or reduced when the moving clamp arm reciprocates in the connecting channel; the limiting groove 1 limits the rotation of the moving clamp arm around the central axis of the connecting channel, so that the moving clamp arm can only reciprocate in the axial direction of the connecting channel.

6. The reference frame quick-release clamp according to claim 3, characterized in that: A limiting cap is provided at the end of the driving bolt away from the connecting channel, and the outer diameter of the limiting cap is larger than the inner diameter of the connecting channel; the limiting cap is provided with a groove; a limiting boss is arranged around the outer wall of the driving bolt, and the outer diameter of the limiting boss is not larger than the inner diameter of the connecting channel; the fixed clamp arm is provided with a pin hole 1, and the pin hole 1 is connected to the connecting channel, and a pin shaft 1 is provided to move in the pin hole 1, and when the pin shaft 1 enters the connecting channel, the axial movement of the driving bolt is limited; the limiting cap does not contact the limiting boss.

7. The reference frame quick-release clamp according to claim 3, characterized in that: The fixed clamp arm is provided with a second pin hole, the second pin hole is communicated with the connecting channel, and a second pin shaft is provided in the second pin hole for movement; when the second pin shaft enters the connecting channel through the second pin hole, the moving clamp arm is restricted from leaving the connecting channel.

8. The reference frame quick-release clamp according to claim 7, characterized in that: The moving clamp arm is provided with a second limiting groove. When the moving clamp arm moves to a distal position in the connecting channel, the second pin abuts against the inner wall of the second limiting groove.

9. The reference frame quick-release clamp according to claim 1, characterized in that: The fixed clamp arm is provided with a connecting frame, the connecting frame is provided with a positioning screw hole, the number of the positioning screw hole is at least one, and the setting frame with the NDI ball is connected to the connecting frame.

10. The reference frame quick-release clamp according to claim 3, characterized in that: Along the axial direction of the driving bolt, the length of the portion of the driving bolt whose outer diameter is smaller than the inner diameter of the connecting channel is not less than the length of the connecting channel. When the driving bolt rotates and drives the moving clamp arm to disengage from the connecting channel, the axial length of the portion of the driving bolt that is sleeved in the connecting screw hole is greater than zero.

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